4.1 T4 Hardware [T-Series Datasheet] | LabJack
« Close

Datasheets and User Guides

App Notes

Software & Driver


4.1 T4 Hardware [T-Series Datasheet]

T4 Hardware Overview

The T4 has 3 different I/O areas:

  • Communication Edge: The communication edge (top edge in Figure 4.1-1) has a USB Type-B connector and an RJ45 Ethernet connector.  Power is always provided through the USB connector, even if USB communication is not used.
  • Screw Terminal Edges: The screw terminal edges have convenient connections for the 2 analog outputs, 4 high-voltage analog inputs, and 4 flexible I/O (digital I/O, low-voltage analog inputs, or DIO-EF.  The screw terminals are arranged in blocks of 4, with each block consisting of VS, GND, and two I/O.  Also on the left screw-terminal edge are two LEDs. The Comm LED generally blinks with communication traffic, while the Status LED is used for other indications.
  • DB Edge: The DB Edge has a 15-pin female D-sub type connector (DB15) which has 12 digital I/O called EIO and CIO. The first 4 EIO lines can be configured as low-voltage analog inputs.  The first 2 EIO lines and the 4 CIO lines support some DIO-EF features (timers, counters, etc.).

U3 Hardware Description

Figure 4.1-1. LabJack T4

USB:  Can be used for host communication.  Power is always provided through this connector.

Ethernet:  10/100Base-T Ethernet connection can be used for host communication.

LEDs:  The Power and Status LEDs convey different information about the device.

VS:  All VS terminals are the same.  These are outputs that can be used to source about 5 volts.

GND/SGND:  All GND terminals are the same.  SGND has a self-resetting thermal fuse in series with GND.

FIO#/EIO#/CIO#:  These are the 16 digital I/O, and are also referred to as DIO4-DIO19.  Besides basic digital I/O operations, some of these terminals can be configured with Extended Features (frequency input, PWM output, etc.), some can be configured as low-voltage analog inputs, and all can be configured for various serial protocols: I2C serial, SPI serial, SBUS serial (EI-1050, SHT sensors), 1-Wire serial, and Asynchronous serial.

AIN#:  AIN0-AIN3 are the 4 high-voltage (±10V) analog inputs.

DAC#:  DAC0 & DAC1 are the 2 analog outputs.  Each DAC can be set to a voltage between about 0.01 and 5 volts with 10-bits of resolution.


For information about reading inputs, start in Section 3.  For information about setting outputs, start with the Waveform Generation Application Note.



Figure 4.1-2.  Block Diagram